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+--[[
+ Copyright (C) 2016 "IoT.bzh"
+ Author Fulup Ar Foll <fulup@iot.bzh>
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+
+ Provide sample policy function for AGL Advance Audio Agent
+--]]
+
+-- Global HAL registry
+_Audio_Hal_Registry={}
+
+-- Callback when receiving HAL registry
+function _Alsa_Get_Hal_CB (error, result, context)
+ -- Initialise an empty table
+ local registry={}
+
+ -- Only process when response is valid
+ if (error) then
+ AFB_ErrOr ("[Audio_Init_CB] ErrOr result=%s", result)
+ return
+ end
+
+ -- Extract response from result
+ local response=result["response"]
+
+ -- Index HAL Bindings APIs by shortname
+ for key,value in pairs(response) do
+ registry[value["shortname"]]=value["api"]
+ end
+
+ -- store Exiting HAL for further use
+ printf ("-- [Audio_Init_CB] -- Audio_register_Hal=%s", Dump_Table(registry))
+ _Audio_Hal_Registry=registry
+
+end
+
+-- Function call at binding load time
+function _Alsa_Get_Hal(args)
+
+ printf ("[-- Audio_Get_Hal --] args=%s", Dump_Table(argsT))
+
+ -- Query AlsaCore for Active HALs (no query, no context)
+ AFB:service ('alsacore', 'hallist', {}, "_Alsa_Get_Hal_CB", {})
+
+end
+
+-- In sample configuration Query/Args parsing is common to all audio control
+local function Audio_Parse_Request (source, args, query)
+
+ local apihal={}
+
+ -- In this test we expect targeted device to be given from query (could come for args as well)
+ if (query == nil ) then
+ AFB:error ("--LUA:Audio_Set_Navigation query should contain and args with targeted apihal|device")
+ return -- refuse control
+ end
+
+ -- Alsa Hook plugin asound sample config provides target sound card by name
+ if (query["device"] ~= nil) then
+ apihal=_Audio_Hal_Registry[query["device"]]
+ end
+
+ -- HTML5 test page provides directly HAL api.
+ if (query["apihal"] ~= nil) then
+ apihal= query["apihal"]
+ end
+
+ -- if requested HAL is not found then deny the control
+ if (apihal == nil) then
+ AFB:error ("--LUA:Audio_Set_Navigation No Active HAL Found")
+ return -- refuse control
+ end
+
+ -- return api or nil when not found
+ return apihal
+end
+
+-- Set Navigation lower sound when play
+function _Audio_Set_Navigation(source, args, query)
+
+ -- in strict mode every variables should be declared
+ local err=0
+ local ctlhal={}
+ local response={}
+ local apihal={}
+
+ AFB:notice ("LUA:Audio_Set_Use_Case source=%d args=%s query=%s", source, args, query);
+
+ -- Parse Query/Args and if HAL not found then refuse access
+ apihal= Audio_Parse_Request (source, args, query)
+ if (apihal == nil) then return 1 end
+
+
+ -- if source < 0 then Alsa HookPlugin is closing PCM
+ if (source < 0) then
+ -- Ramp Up Multimedia channel synchronously
+ ctlhal={['label']='Master_Playback_Volume', ['val']=100}
+ err, response= AFB:servsync (apihal, 'ctlset',ctlhal)
+ else
+ -- Ramp Down Multimedia channel synchronously
+ ctlhal={['label']='Master_Playback_Volume', ['val']=50}
+ err, response= AFB:servsync (apihal, 'ctlset',ctlhal)
+ end
+
+ if (err) then
+ AFB:error("--LUA:Audio_Set_Navigation halapi=%s refuse ctl=%s", apihal, ctlhal)
+ return 1 -- control refused
+ end
+
+
+ return 0 -- control accepted
+end
+
+
+-- Select Multimedia mode
+function _Audio_Set_Multimedia (source, args, query)
+
+ -- in strict mode every variables should be declared
+ local err=0
+ local ctlhal={}
+ local response={}
+ local apihal={}
+
+ AFB:notice ("LUA:Audio_Set_Use_Case source=%d args=%s query=%s", source, args, query);
+
+ -- Parse Query/Args and if HAL not found then refuse access
+ apihal= Audio_Parse_Request (source, args, query)
+ if (apihal == nil) then return 1 end
+
+
+ -- if Mumtimedia control only increase volume on open
+ if (source >= 0) then
+ -- Ramp Down Multimedia channel synchronously
+ ctlhal={['label']='Master_Playback_Volume', ['val']=100}
+ err, response= AFB:servsync (apihal, 'ctlset',ctlhal)
+ end
+
+ if (err) then
+ AFB:error("--LUA:Audio_Set_Navigation halapi=%s refuse ctl=%s", apihal, ctlhal)
+ return 1 -- control refused
+ end
+
+
+ return 0 -- control accepted
+end
+
+-- Select Emergency Mode
+function _Audio_Set_Emergency(source, args, query)
+ return 1 -- Always refuse in this test
+end